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1 | /* |
2 | * Copyright Andrey Semashev 2007 - 2015. | |
3 | * Distributed under the Boost Software License, Version 1.0. | |
4 | * (See accompanying file LICENSE_1_0.txt or copy at | |
5 | * http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | /*! | |
8 | * \file fallback_policy_fwd.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 18.08.2012 | |
11 | * | |
12 | * The header contains forward declaration of fallback policies when attribute value visitation or extraction fails. | |
13 | */ | |
14 | ||
15 | #ifndef BOOST_LOG_ATTRIBUTES_FALLBACK_POLICY_FWD_HPP_INCLUDED_ | |
16 | #define BOOST_LOG_ATTRIBUTES_FALLBACK_POLICY_FWD_HPP_INCLUDED_ | |
17 | ||
18 | #include <boost/log/detail/config.hpp> | |
19 | ||
20 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
21 | #pragma once | |
22 | #endif | |
23 | ||
24 | namespace boost { | |
25 | ||
26 | BOOST_LOG_OPEN_NAMESPACE | |
27 | ||
28 | /*! | |
29 | * The \c fallback_to_none policy results in returning an empty value reference if the attribute value cannot be extracted. | |
30 | */ | |
31 | struct fallback_to_none; | |
32 | ||
33 | /*! | |
34 | * The \c fallback_to_throw policy results in throwing an exception if the attribute value cannot be extracted. | |
35 | */ | |
36 | struct fallback_to_throw; | |
37 | ||
38 | /*! | |
39 | * The \c fallback_to_default policy results in a default value if the attribute value cannot be extracted. | |
40 | */ | |
41 | template< typename DefaultT > | |
42 | struct fallback_to_default; | |
43 | ||
44 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
45 | ||
46 | } // namespace boost | |
47 | ||
48 | #endif // BOOST_LOG_ATTRIBUTES_FALLBACK_POLICY_FWD_HPP_INCLUDED_ |